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Loop transmission method

  • US 4,685,105 A
  • Filed: 10/22/1985
  • Issued: 08/04/1987
  • Est. Priority Date: 10/22/1984
  • Status: Expired due to Fees
First Claim
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1. A loop transmission method which makes a plurality of time-divided slots circulate on a looped transmission line connecting a plurality of transmission apparatuses, including a transmission apparatus sending out data having a destination address in said slots, and a transmission apparatus for receiving said data, thereby carrying out communication between said plurality of transmission apparatuses, characterized in thateach of said slots is provided with an access control region where the access control informations of "Free", "Busy" or "Neutral" are to be set,in response to data transmission not being carried out, an access control information at one of said plurality of slots is set to "Free" and access control information at other slots are set to "Neutral" to thereby make said plurality of slots circulate on said looped transmission line,in response to a transmission apparatus, having data to be transmitted, receiving an access control information of "Free" from a certain slot, said transmission apparatus uses said certain slot and a necessary number of the slots subsequent to said slot and sends out the data to the slots, at which time the access control information at each of said slots transmitting the data is set to "Busy", and after the data transmission is completed, the access control information at the next slot is set to "Free", andin response to completion of data transmission, said transmission apparatus, when said slot transmitted data thereby returns to the same slot after it once circulates on said looped transmission line, sets the access control information at said slot to "Neutral".

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